codimer

noun
co·di·mer | \(ˈ)kō¦dīmə(r)\
plural -s

Definition of codimer 

: a copolymer formed from two dissimilar molecules (as two olefins) specifically, in petroleum refining : the mixture of hydrocarbons formed by the copolymerization of the butylenes which on hydrogenation yields a mixture of octanes used as a blending agent in aviation gasoline

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History and Etymology for codimer

co- + dimer

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